When a fan is turned off, its angular speed decreases from 10 rad/s to 6.3 rad/s in 5.0 s. What is the magnitude of the average angular acceleration of the fan?
A) 0.86 rad/s2
B) 0.74 rad/s2
C) 0.37 rad/s2
D) 11 rad/s2
E) 1.2 rad/s2
B
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For an edge dislocation, the Burger’s vector is _____________to the dislocation line.
Fill in the blank(s) with the appropriate word(s).
Rotational Kinetic Energy: Consider a solid uniform sphere of radius R and mass M rolling without slipping. Which form of its kinetic energy is larger, translational or rotational?
A. Translational kinetic energy is larger. B. Rotational kinetic energy is larger. C. Both are equal. D. You need to know the speed of the sphere to tell.
Carl has a 5-inch refracting telescope, and Jim has a 3-inch reflecting telescope. Whose telescope has a higher light-gathering power?
A. Carl's, because lenses gather more light. B. Carl's, because the larger the diameter, the more light to be collected. C. Jim's, because the smaller the diameter, the more light to be collected. D. Jim's, because mirrors gather more light.
If you strip electrons from an atom, the atom becomes a
A) positive ion. B) negative ion. C) different element.